Undercut gate.



PATBNTED FEB. 10, 1903.

UNDBRGUT GATE. APPLICATION nun 001:. as,- 19o 2.

; Burrs-slum 1.

No. 720,428; v

.10 KODEL.

No. 720,428. PA'TENTED FEB. 10, 1903.

F. V. HETZBL.

UNDERGUT GATE.

APPLICATION FILBD O OT. 25, 1902. N0 MODEL. 3 SHEETS-SHEET 2.

m: Nnnms PETERS an. FHOTO-LITHQ. WASHENGTBN. D c.

No. 720,428,; PATENTBD FEB. 10, 190s.

P. v. HETZEL... I

UNDBRGUT GATE.

7 APPLICATION IILED 001225, 1902.

3 8HEBTS-SHEET 3.

-H0 MODEL.

UNITED STATES PATENT OFFICE.

FREDERIC V. HETZEL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE LINK BELT ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

UNDERCUT GATE.

SPECIFICATION forming part of Letters Patent No. 720,428, dated February 10, 1903. Application filed October 25, 1902. Serial No. 128,770. (No model.)

To all whom it may concern:

Be it known that I, FREDERIC V. HETZEL, a citizen of the United States, residing in Phila-' delphia, Pennsylvania, have invented certain Improvements in Undercut Gates, or which the following is a specification.

The object of my invention is to so construct the mechanism for operating a gate for chutes as to avoid the severe racking that strains the gate and causes it usually to bind around the center.

In the accompanying drawings, Figure l is a side View of a coa1-chute,il1ustrating my improved gate-operating mechanism. Fig. 2

I 5 is a front View of the coal-chute. Figs. 3 and 4 are perspective views showing the gate detached from the chute, and Fig. 5 is a view of a modification.

A is a hopper for containing coal or other material. B is a chute secured to the face of the hopper in any suitable manner. This chute has side plates 1) b and an inclined bottom plate b. The ends of the side plates are formed in the segment of a circle to accommodate the swinging of the segmental gate D from its center d, as shown in Fig. 3.

The gate comprises two side members D and a cross member 01, and the cross member is secured to the side members'by bolts or rivets. The gate, as shown herewith, is hung on studs 6, projecting from the side plates 1) of the chute B, so that thegate can swinginto and out of position, although athrough-shaft may be employed to support the gate. The

' side plates D are extended to form segmental racks D with which engage the pinions ff, which are mounted on a cross-shaft F, mounted in bearings g on the. chute B. On-the end of the shaft F in the present instance is a 40 chain-wheel F, around which passes the operating-chain f, so that when the wheel is turned the gate will be opened or closed.

In place of the chain and chain-wheel a hand-wheel may be used, or the shaft maybe operated by a train of gears.

The method of construction above described brings an'equal strain upon both sides of the gate and causes it to work very much freer than the gate now used.

It will be understood, particularly with such material as coal, that there is considerable weight against the gate when it is closed, and consequently it the gate were operated from one side only it would causea considerable strain upon the gate and cause it to bind on its pivots. I

I is an extension-chute, preferably swung from the pins e, on Whichthe gate is hung. This extension-chute can be raised and lowered by a rod t', connected to a frame I, which is pivoted at t" to the outer end of the supplemental chute 1. Any suitable connection may be used for the purpose of raising and lowering the chute, and the chute may be dispensed with in some instances.

Fig. 3 is a view of a modification of my invention, in which the segment D is arranged at right angles to the gate. In this constructionthe pivot-pin 6 can be placed farther away from the curved portion of the gate.

The shaft F extends across the chute and has pinions gearing with the segments on each side of the chute. In this instance I have shown a hand-wheel on the shaft instead of a chain-wheel.

I claim as my invention 1. The combination of a chute, a pivoted segmental gate for the chute, two segmental racks, one on each side of the gate, an operating-shaft, with pinions on the operatingshaft, one pinion engaging with one rack and the other pinion engaging with'the other rack, substantially as described.

2. The combination of a chute having a segmental end, a segmental gate closing the end of the chute, said gate having side members pivoted to the chute, said side members extending beyond the pivot and forming segmental racks, with a cross-shaft mounted in "bearings on the chute and having pinions, go

one pinion engaging with one rack and the other pinion engaging with the other rack, substantially as described.

3. The combination of an inclined chute, with an findercut gate consisting of a cross 5 member and two side members, the gate being in the form of a segment, the said side members being pivoted to the chute, a seg mental rack formed on each side member, a In testimony whereof I have signed my transverse shaft mounted in hearings on the name to this specification in the presence of chute, an operating-wheel on the end of the two subscribing Witnesses.

shaft, and pinions also on the shaft, one pin- FREDERIC V. HETZEL. ion meshing with one segmental rack and the Vitnesses:

other pinion meshing with the other segmen- MURRAY 0. BOYER,

tal rack, substantially as described. WILL. A. BARR. 

